Choose the correct tense to complete the sentence: 'The legal industry ______ stagnant since the ownership rules were established.'
答案解析
核心考点：时态应用（现在完成时）。解题思路：时间状语"since"要求主句用现在完成时。正确选项C("has been")体现持续状态，错误选项A/B忽略时间延续性，D("had been")需有过去时间参照点。易错点：未识别"since"对时态的限定作用。
正确答案：C